Donna's much more his equal than either Rose or Martha were, I think. I sometimes wonder if it's my own bias - I'm closer in age to Donna and find it easier to identify with her - but then I watch again and realise that no, she was actually written that way. And despite the 900-odd-year age gap, and his "alien-ness", she seems to understand him instictually. I don't think the Doctor has ever had a companion like her before, and you can see that he absolutely loves the way she challenges him and the way she shares the squee over new places and new adventures.
The off-screen chemistry between David and Catherine spills onto the screen by the bucket-load; I can't help but think that if things between Ten and Donna had ever had the chance to go from platonic to romantic, they'd have short-circuited my TV!
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And despite the 900-odd-year age gap, and his "alien-ness", she seems to understand him instictually. I don't think the Doctor has ever had a companion like her before, and you can see that he absolutely loves the way she challenges him and the way she shares the squee over new places and new adventures.
The off-screen chemistry between David and Catherine spills onto the screen by the bucket-load; I can't help but think that if things between Ten and Donna had ever had the chance to go from platonic to romantic, they'd have short-circuited my TV!